By Waqar Malik
If you're an iOS developer or making plans to turn into one, studying fast 2 is your number 1 precedence, and this book tells you every thing you want to wake up to hurry, good, rapidly.
You'll begin with the rapid Playground and an creation to object-oriented programming so that you can instantly see rapid in motion. then you definitely know about the entire key language positive aspects like features and closures, sessions, equipment, extensions, and the way rapid works simply in addition to Objective-C by way of effortless reminiscence administration with ARC.
Finally you are going to use speedy along Objective-C in addition to with middle information, and you can easy methods to placed the entire items including a overall healthiness app utilizing Apple's HealthKit framework.
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Additional resources for Learn Swift 2 on the Mac
This will show a popup menu with options to add different items to the project one of the item is new Playground. Select this option and save the new playground. The new playground will be automatically added to the project workspace. printMessage() If you open the Assitant Editor, you will see output from the framework Keep in mind that if you change any code in the framework you will need to build the application so that the framework gets rebuilt. If you do not do this step the new code will not be available in the playground.
The other kind of comment is a multiline comment; it with a /* and ends with a */ and it can span multiple lines. /* this the first line of comment, it continues on the second line */ Rich Text Comments There is an extra colon ( right after the start of the comment (//). Xcode now supports comments in rich text using the Markdown format; if you add the colon then you can write the comment in Markdown format. However, they look the same. Let’s update the comment to look like this: //: Playground - **noun**: a place where people can *play* Next, select select menu option Editor ➤ Show Rendered Markup; you will see the comments with all the formatting.
What? It means that the type of variable is inferred by the kind of initial value that is assigned to it. Once the initial type is set for a variable, it cannot be changed. If you try to set an integer value to the variable str, the compiler will give you an error, as shown in line 6 of Figure 2-3. 18 CHAPTER 2: The Swift Playground in Xcode Figure 2-3. Error when assigning wrong type To assign an integer to a String type, we much convert it to a string first. We do this by creating a new string object using the initializer String(59), and now we are good to proceed.